Film material for cinematograph and other positive films



Patented Dec. 14,A 1926.

N 1,610,827 PATENT oFF-ICE.

JOHN EDWARD THORNTON, OF LONDON, D.

FILM MATERIAL FOR CINEMATOGRA-PH AND THER POSITIVE FILMS.

original application -led December 13, 1923, Serial No. 680,511, and in Great Britain December 27, 1922'.

Divided and this application filed June 8, 1925. Serial No. 35,760.v

The-object of this invention is to provide a special form of ready-'colored film-material for use in producing two-color positive pictures by photographic printing methods upon continuous strips of sensitive film for cinematograph pictures vor for stationary pictures in series; and,v particularly .for producing such positives of the special type described in a concurrent application Serial Y No.- 680,511 yfiled 13th December 1923, i-n

which twocolor series pictures are produced as a single film of' standard width and thickness, by building up from a double-width film of half standard thickness and by printing ltwo section-images simultaneously side-by-side, but of different complementary colors such as orange-red and blue-green, from a suitable pair of negative-images or printing-clichs. v

Hitherto two-color films have been produced by printing (a) two images upon op-- posite sides of a central Celluloid or similar support sensitized upon both sides, or (b) by printing each image upon one side of a separate Celluloid or similar thinner sup- Jort, and then cementing4 the two supports back to back to form such central support,

: and by dyeing, toning, or otherwise coloring the two series'images after printing.

This subsequent coloring operation has proved inconvenient as itinvolves the need f'or special care to ensure matched density of the separate coloring, and ifs'uch care is insuiiiciently exercised the film-printer suffers the loss of much expensive material.

By the present invention a. far more convenient and certain process of producing the finished prints is rendered possible.

According to this invention the two colorings of exactly the correct shade are incorporated with the film-material during its manufacture in exactly the correct proportions, and all the film-printer has to do is to Acorrectly expose and develop the sensitive film-material to a standard time and temperature in order to produce perfect prints by automatic machinery without need for the old-style methods of hand development. Ready-colored film-material such as herein described can be used for producing prints having relief images by exposing from the back through the celluloid and developing from the front (or sensitive) face. It can also be used for producing non-relief images dried, and when the by printing and developing from the front (or sensitive) face.

X It also allows the construction of twopiece two-color films with their imagesl enclosed between two thin Celluloid supports which form outer covers; or with their images on the two opposite ou'tsidcs, with a central Celluloid support within.

By using this double-width positive-filmmaterial with the coloring matter incorporated ltherein in conjunction with a double-widthnegative strip or printing-clich, exposures for both sections of the same image are made simultaneously, both images are developed and treated simultaneously and expansion or contraction of both sections is uniform, so that both images are of exactly thesame size when finished and printed film is longitudinally severed to produce two singlewidth strips the two partsof the same picture will accurately register when the two films are superimposed and cemented together. i

Dzereat se'zsz'tz'zz'ng processes.

printing with two section images of difi Iferent colorsbefore slitting into two.

Fig. 4 is a view of the completed film with the two parts superposed and cemented together either face-to-face or back-to-back.

Fig. 5 is a similar View of wide web with alternating stripes of color.

Manufacturing the, #lm-material.

In manufacturing the film itself I start by forming a very thin transparent base A of Celluloid, cellulose-acetate, or similar waterproof material. A suitable thickness is .0015 inch. This is coated upon one side with an adhesive substratum B of the kind known to those versed in the art of film manufacture. When dry a further coating C is applied, of a thickness of about .001 inch, consisting of a suitable colloid such as gelatine, gum, albumen, fish glue'or the like, according to the type of sensitizing process adopted, with which is incorporated either opaque pigment as used in the carbon process; or dye; or pigment and dye; or silverbromide and pigment; or silver-bromide, dye, and a mordant; or silver-bromide, pigment, dye, and a mordant. The average monochrome standard film is about .006 inch thick, whereas these section films are each less than .003 inch thick, until joined together, when they yield a completed film of the standard thickness.

The film-support may be a double-width strip upon which the colored colloid is coated in the form of two differently-colored 'parallel stripes, but for convenience it is preferred to manufacture the film as a wide web, the colored colloid being applied as a series of alternating stripes of orange-red and blue-green, each extending longitudinally ofthe web, and when slit into double-width strips, each strip comprises the two pairs forming one set of the complementary colors required to produce complete two-color pictures.

The strips are next perforated to suit the yprinting and other machines by which the prints are to be produced Ciaracteristz'cs of dz'erent seqzsz'tzzers.,

If the film contains silver-bromide it will be of the rapid printing variety, requiring a short exposure to light, subsequent developing and fixing, followed by treatment in a hardening and bleaching or oxidizing bath. Alternatively silver-chloride, iodide or other silver salts may be used.

If the film does not contain silver salts the and these are described in detail in a concurrent applicationv which deals with production of the print.

By this invention is produced a readycolored film-material of double-standard width and half-standard thickness, for the production of cinematograph or other twocolor positives in series in the form of films of standard width and standard thickness, and of the type built-up from two singlewidth films of only half-standard thickness, and which after printing are cemented together either face-to-face (printed-colloid to yprinted-colloid) or back-to-back (celluloidsupport to Celluloid-support) to form a single lm of standard width and thickness.l Y

iVhat I claim as my invention and desire tov protect by Letters Patent is z- 1. A film material for the production of two-color film-positives 'comprising a base support of transparent waterproof material double the width and half the thickness of' the finished filmpositive, a stripe of colored colloid longitudinal of" the film of one color coated on one half of the base and a parallel longitudinal stripe of colored colloid of another color coated upon the other halt' of' the base.

2. A film material for the production of two-color film-positives comprising a base support of transparent waterproof material double the width and half the thickness of the finished film positive, a stripe of colored colloid longitudinal of the film of one color coated on one half of' the base and a parallel longitudinal stripe of colored colloid of Cil Bft,

a complementary color coated upon the other half ofr the base.

3. A film material for the production of two-color film-positives comprising a base support of transparent waterproof material double the width and half the thickness of Athe finished film positive, a longitudinal stripe of colloid colored orange-red coated upon one half of the base and a parallel longitudinal stripe of colloid colored blue-green coated upon the other half of the base.

4.` A film material for the production of two-color film-positives comprising a base supporty of transparent waterproof material double the width and half the thickness of the finished film positive, a strip of sensi- .tized colored colloid longitudinal of the film tized colored colloid of another color coated i uponl the other half of the base;

5. A film material for the production of two-color film-positives comprising a base i support of transparent waterproof material double the Width and halt' the thickness of' the finished film positive a stripe of sensitized coloredA colloid longitudinal of the film of one color coated on one half of the base and a parallel longitudinal stripe of sensitized colored colloid of a complementary color coated upon the other half of the base.

6. A film-material for the production of two-color film-positives comprising a base support of transparent Waterproof material double the width and half the thickness of' the finished film positive, a longitudinal stripe of sensitized colloidcolored orangered coated upon one half of the base and a .parallel'longitudinal stripe of sensitized col- 7. A film-material for the production of two-color cinematograph film-positives com- .f

prising in its construction a strip of transparent waterproof material of halt standard thickness coated with a layer of colloid with which is incorporated coloring matter the colored colloid comprising a plurality of alternating longitudinal stripes of two complementary colors adapted to be severed into strips of double standard width.

8. A film-material for the production of two-color cinematograph film-positives comprising a strip of celluloid'of half Standard thickness, a layer of colloid coated thereon with which is incorporated coloring matter in a plurality of alternating longitudinal stripes of orange-red and blue-green adapted to be severed into strips of double Standard with with two stripes of color on each.

9. A film material for the production ot two-colorcinematograph film-positives co1nprising in its construction a strip of transparent waterproofvmaterial of half standard thickness `coated with a layer of sensitized colloid with which is incorporated coloring matter the sensitized colored colloid com prising a plurality ofl alternating longitudinal stripes of two complementary colors adapted to be severed into strips of double standard width. e*

10. A film material for the production ot two-color cinematograph film-positives comprising a strip of celluloid of half standard thickness a layer of sensitized colloid coated thereon with which is incorporated coloring matter in a plurality of alternating longitudinal stripes A.of orange-red and blue-green adapted to be severed into strips of double starlildard width with two stripes of color on eac 11. A ready-colored film-material for the 4production of cinematograph two-colorlmpositives comprisingv in its construction and manufacture the following arrangement and combination of parts (A) a base-support of `transparent waterproof` material of double the width and half the thickness of the finished film; (B) a layer of adhesive substratum superimposed upon the base-support A, and effecting a union between layers A and C; (C) a layer of colloid, spread in the form l of two longitudinal parallel stripes differently-colored and directly superimposed upon the substratum-layer B and 1ndirectly superimposed u-pon the base-sup? port A.

12. A ready-colored film-material for the .production of two-color cinematograph film 'port A.

13. A read -colored film-material for the production o two-color cinematograph positives comprising in its construction a base support of transparent waterproof material of double-standard width and half-standard thickness, a layer of adhesive substratum superimposed on the base, a layer of colored colloid in two longitudinal parallel stripes adhered to the base by the adhesive, the colored stripes comprising orange-red coloring matter incorporatedwith the colloid covering one half of the film and with blue-green coloring matter incorporated in the colloid covering the other half of the film the two colors being complementa-ry to each other and suitably balancedto give a true blending in a printed picture and a sensitizing medium incorporated in the colored colloid layer.

v14. A ready-colored film-strip as in claim 1, provided with perforations for accurately registering the prints upon the double-width strip, and for moving the film through projection apparatus when the two thin films have been cemented together to form aA single-film-strip.

In testimony whereof I have hereunto set my hand.

JHN EDWARD THORNTON. 

